Question

我需要找到所有值都相同的矩阵。我应该如何遍历数组以比较这些值？

示例正确：

[{"id": 1 ,"value": cow},{"id": 1 ,"value": cow},{"id": 1 ,"value": cow}] // true

错误示例：

[{"id": 1 ,"value": cow},{"id": 2 ,"value": cat},{"id": 1 ,"value": cow}] // false

谢谢

Answer 1

您可以将数组中的每个元素与第一个元素进行比较，如果所有元素都相等，则意味着数组中的每个元素都相同：

const input = [{"id": 1 ,"value": 'cow'},{"id": 1 ,"value": 'cow'},{"id": 1 ,"value": 'cow'}];

const [ first, ...rest ] = input;

const result = rest.every((entry) => entry.id === first.id && entry.value === first.value);

console.log(result);

Answer 2

您也可以那样做

var ex1=[{"id": 1 ,"value": "cow"},{"id": 1 ,"value": "cow"},{"id": 1 ,"value": "cow"}] // true

var ex2=[{"id": 1 ,"value": "cow"},{"id": 2 ,"value": "cat"},{"id": 1 ,"value": "cow"}] // false

console.log([...new Set(ex1.map(item => item.id && item.value))].length==1);
console.log([...new Set(ex2.map(item => item.id && item.value))].length==1);

Answer 3

如果数组中的对象看起来像您的对象，那么您就得到了答案。但是，如果您有很多属性，而不仅仅是id和value，则可以尝试以下方法：

// This equals function is written with the help of `https://stackoverflow.com/a/6713782/4610740` Special thanks to him.
Object.prototype.equals = function( that ) {
  if ( this === that ) return true;
  if ( ! ( this instanceof Object ) || ! ( that instanceof Object ) ) return false;
  if ( this.constructor !== that.constructor ) return false;

  for ( var p in this ) {
    if ( ! this.hasOwnProperty( p ) ) continue;
    if ( ! that.hasOwnProperty( p ) ) return false;
    if ( this[ p ] === that[ p ] ) continue;
    if ( typeof( this[ p ] ) !== "object" ) return false;
    if ( ! Object.equals( this[ p ],  that[ p ] ) ) return false;
  }

  for ( p in that ) {
    if ( that.hasOwnProperty( p ) && ! this.hasOwnProperty( p ) ) return false;
  }

  return true;
}

function isSame(array) {
  const [first, ...others] = array;
  return isEqual = others.every(item => item.equals(first));
}


const data = [{"id": 1 ,"value": "cow"},{"id": 1 ,"value": "cow"},{"id": 1 ,"value": "cow"}];
const data2 = [{"id": 1 ,"value": "cow"},{"id": 2 ,"value": "cat"},{"id": 1 ,"value": "cow"}];

console.log(isSame(data));
console.log(isSame(data2));

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验证数组中的值相同或不同

3 个答案: